diff --git a/lib/std/c/openbsd.zig b/lib/std/c/openbsd.zig
index 341426ce62..553b6a2c52 100644
--- a/lib/std/c/openbsd.zig
+++ b/lib/std/c/openbsd.zig
@@ -1635,3 +1635,9 @@ pub const HW = struct {
     pub const NCPUONLINE = 25;
     pub const POWER = 26;
 };
+
+pub const PTHREAD_STACK_MIN = switch (builtin.cpu.arch) {
+    .sparc64 => 1 << 13,
+    .mips64 => 1 << 14,
+    else => 1 << 12,
+};